Take someone with you...do not get in a fight. It is much better to expose using your chain of command. Have a friend go knock on the door and act like he is at the wrong apartment to confirm he is there. How did you get the information that he was a Lt Col married to a Col? There can't be that many at one base? Check the Bio's and use your knowledge of your W duty section to narrow the possibilities. There has to be some type of interaction...PT, lunch, offiical events that will help you. If you can do some leg work yourself you can save money to get a PI involved so you can use the information in court for custody and alimony. Let's also hope it never goes that far. You really need to get some proof and expose quickly. Take care